bool isry(int y)
	{
		if(y%4==0&&y%100!=0)
			return true;
		if(y%400==0)
			return true;
		return false;
	}

class Date
{
	int year;
	int month;
	int day;
public:
	Date(int y,int m,int d);	
	Date(const Date &da);
	Date& operator=(const Date &da);
	int lastdate();
	int shengxiao();
	Date& operator+(int left);
	bool operator>(Date & right);
};